diff options
Diffstat (limited to 'linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c')
| -rw-r--r-- | linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c | 372 |
1 files changed, 0 insertions, 372 deletions
diff --git a/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c b/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c deleted file mode 100644 index 145e795d29..0000000000 --- a/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c +++ /dev/null @@ -1,372 +0,0 @@ -/****************************************************************************** - * vbd.c - * - * XenLinux virtual block-device driver (xvd). - * - * Copyright (c) 2003-2004, Keir Fraser & Steve Hand - * Modifications by Mark A. Williamson are (c) Intel Research Cambridge - * Copyright (c) 2004-2005, Christian Limpach - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License version 2 - * as published by the Free Software Foundation; or, when distributed - * separately from the Linux kernel or incorporated into other - * software packages, subject to the following license: - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this source file (the "Software"), to deal in the Software without - * restriction, including without limitation the rights to use, copy, modify, - * merge, publish, distribute, sublicense, and/or sell copies of the Software, - * and to permit persons to whom the Software is furnished to do so, subject to - * the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING - * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS - * IN THE SOFTWARE. - */ - -#include "block.h" -#include <linux/blkdev.h> -#include <linux/list.h> - -#ifdef HAVE_XEN_PLATFORM_COMPAT_H -#include <xen/platform-compat.h> -#endif - -#define BLKIF_MAJOR(dev) ((dev)>>8) -#define BLKIF_MINOR(dev) ((dev) & 0xff) - -/* - * For convenience we distinguish between ide, scsi and 'other' (i.e., - * potentially combinations of the two) in the naming scheme and in a few other - * places. - */ - -#define NUM_IDE_MAJORS 10 -#define NUM_SCSI_MAJORS 17 -#define NUM_VBD_MAJORS 1 - -static struct xlbd_type_info xlbd_ide_type = { - .partn_shift = 6, - .disks_per_major = 2, - .devname = "ide", - .diskname = "hd", -}; - -static struct xlbd_type_info xlbd_scsi_type = { - .partn_shift = 4, - .disks_per_major = 16, - .devname = "sd", - .diskname = "sd", -}; - -static struct xlbd_type_info xlbd_vbd_type = { - .partn_shift = 4, - .disks_per_major = 16, - .devname = "xvd", - .diskname = "xvd", -}; - -static struct xlbd_major_info *major_info[NUM_IDE_MAJORS + NUM_SCSI_MAJORS + - NUM_VBD_MAJORS]; - -#define XLBD_MAJOR_IDE_START 0 -#define XLBD_MAJOR_SCSI_START (NUM_IDE_MAJORS) -#define XLBD_MAJOR_VBD_START (NUM_IDE_MAJORS + NUM_SCSI_MAJORS) - -#define XLBD_MAJOR_IDE_RANGE XLBD_MAJOR_IDE_START ... XLBD_MAJOR_SCSI_START - 1 -#define XLBD_MAJOR_SCSI_RANGE XLBD_MAJOR_SCSI_START ... XLBD_MAJOR_VBD_START - 1 -#define XLBD_MAJOR_VBD_RANGE XLBD_MAJOR_VBD_START ... XLBD_MAJOR_VBD_START + NUM_VBD_MAJORS - 1 - -/* Information about our VBDs. */ -#define MAX_VBDS 64 -static LIST_HEAD(vbds_list); - -static struct block_device_operations xlvbd_block_fops = -{ - .owner = THIS_MODULE, - .open = blkif_open, - .release = blkif_release, - .ioctl = blkif_ioctl, -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) - .getgeo = blkif_getgeo -#endif -}; - -DEFINE_SPINLOCK(blkif_io_lock); - -static struct xlbd_major_info * -xlbd_alloc_major_info(int major, int minor, int index) -{ - struct xlbd_major_info *ptr; - - ptr = kzalloc(sizeof(struct xlbd_major_info), GFP_KERNEL); - if (ptr == NULL) - return NULL; - - ptr->major = major; - - switch (index) { - case XLBD_MAJOR_IDE_RANGE: - ptr->type = &xlbd_ide_type; - ptr->index = index - XLBD_MAJOR_IDE_START; - break; - case XLBD_MAJOR_SCSI_RANGE: - ptr->type = &xlbd_scsi_type; - ptr->index = index - XLBD_MAJOR_SCSI_START; - break; - case XLBD_MAJOR_VBD_RANGE: - ptr->type = &xlbd_vbd_type; - ptr->index = index - XLBD_MAJOR_VBD_START; - break; - } - - if (register_blkdev(ptr->major, ptr->type->devname)) { - kfree(ptr); - return NULL; - } - - printk("xen-vbd: registered block device major %i\n", ptr->major); - major_info[index] = ptr; - return ptr; -} - -static struct xlbd_major_info * -xlbd_get_major_info(int vdevice) -{ - struct xlbd_major_info *mi; - int major, minor, index; - - major = BLKIF_MAJOR(vdevice); - minor = BLKIF_MINOR(vdevice); - - switch (major) { - case IDE0_MAJOR: index = 0; break; - case IDE1_MAJOR: index = 1; break; - case IDE2_MAJOR: index = 2; break; - case IDE3_MAJOR: index = 3; break; - case IDE4_MAJOR: index = 4; break; - case IDE5_MAJOR: index = 5; break; - case IDE6_MAJOR: index = 6; break; - case IDE7_MAJOR: index = 7; break; - case IDE8_MAJOR: index = 8; break; - case IDE9_MAJOR: index = 9; break; - case SCSI_DISK0_MAJOR: index = 10; break; - case SCSI_DISK1_MAJOR ... SCSI_DISK7_MAJOR: - index = 11 + major - SCSI_DISK1_MAJOR; - break; - case SCSI_DISK8_MAJOR ... SCSI_DISK15_MAJOR: - index = 18 + major - SCSI_DISK8_MAJOR; - break; - case SCSI_CDROM_MAJOR: index = 26; break; - default: index = 27; break; - } - - mi = ((major_info[index] != NULL) ? major_info[index] : - xlbd_alloc_major_info(major, minor, index)); - if (mi) - mi->usage++; - return mi; -} - -static void -xlbd_put_major_info(struct xlbd_major_info *mi) -{ - mi->usage--; - /* XXX: release major if 0 */ -} - -static int -xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size) -{ - request_queue_t *rq; - - rq = blk_init_queue(do_blkif_request, &blkif_io_lock); - if (rq == NULL) - return -1; - -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10) - elevator_init(rq, "noop"); -#else - elevator_init(rq, &elevator_noop); -#endif - - /* Hard sector size and max sectors impersonate the equiv. hardware. */ - blk_queue_hardsect_size(rq, sector_size); - blk_queue_max_sectors(rq, 512); - - /* Each segment in a request is up to an aligned page in size. */ - blk_queue_segment_boundary(rq, PAGE_SIZE - 1); - blk_queue_max_segment_size(rq, PAGE_SIZE); - - /* Ensure a merged request will fit in a single I/O ring slot. */ - blk_queue_max_phys_segments(rq, BLKIF_MAX_SEGMENTS_PER_REQUEST); - blk_queue_max_hw_segments(rq, BLKIF_MAX_SEGMENTS_PER_REQUEST); - - /* Make sure buffer addresses are sector-aligned. */ - blk_queue_dma_alignment(rq, 511); - - gd->queue = rq; - - return 0; -} - -static int -xlvbd_alloc_gendisk(int minor, blkif_sector_t capacity, int vdevice, - u16 vdisk_info, u16 sector_size, - struct blkfront_info *info) -{ - struct gendisk *gd; - struct xlbd_major_info *mi; - int nr_minors = 1; - int err = -ENODEV; - unsigned int offset; - - BUG_ON(info->gd != NULL); - BUG_ON(info->mi != NULL); - BUG_ON(info->rq != NULL); - - mi = xlbd_get_major_info(vdevice); - if (mi == NULL) - goto out; - info->mi = mi; - - if ((minor & ((1 << mi->type->partn_shift) - 1)) == 0) - nr_minors = 1 << mi->type->partn_shift; - - gd = alloc_disk(nr_minors); - if (gd == NULL) - goto out; - - offset = mi->index * mi->type->disks_per_major + - (minor >> mi->type->partn_shift); - if (nr_minors > 1) { - if (offset < 26) { - sprintf(gd->disk_name, "%s%c", - mi->type->diskname, 'a' + offset ); - } - else { - sprintf(gd->disk_name, "%s%c%c", - mi->type->diskname, - 'a' + ((offset/26)-1), 'a' + (offset%26) ); - } - } - else { - if (offset < 26) { - sprintf(gd->disk_name, "%s%c%d", - mi->type->diskname, - 'a' + offset, - minor & ((1 << mi->type->partn_shift) - 1)); - } - else { - sprintf(gd->disk_name, "%s%c%c%d", - mi->type->diskname, - 'a' + ((offset/26)-1), 'a' + (offset%26), - minor & ((1 << mi->type->partn_shift) - 1)); - } - } - - gd->major = mi->major; - gd->first_minor = minor; - gd->fops = &xlvbd_block_fops; - gd->private_data = info; - gd->driverfs_dev = &(info->xbdev->dev); - set_capacity(gd, capacity); - - if (xlvbd_init_blk_queue(gd, sector_size)) { - del_gendisk(gd); - goto out; - } - - info->rq = gd->queue; - info->gd = gd; - - if (info->feature_barrier) - xlvbd_barrier(info); - - if (vdisk_info & VDISK_READONLY) - set_disk_ro(gd, 1); - - if (vdisk_info & VDISK_REMOVABLE) - gd->flags |= GENHD_FL_REMOVABLE; - - if (vdisk_info & VDISK_CDROM) - gd->flags |= GENHD_FL_CD; - - return 0; - - out: - if (mi) - xlbd_put_major_info(mi); - info->mi = NULL; - return err; -} - -int -xlvbd_add(blkif_sector_t capacity, int vdevice, u16 vdisk_info, - u16 sector_size, struct blkfront_info *info) -{ - struct block_device *bd; - int err = 0; - - info->dev = MKDEV(BLKIF_MAJOR(vdevice), BLKIF_MINOR(vdevice)); - - bd = bdget(info->dev); - if (bd == NULL) - return -ENODEV; - - err = xlvbd_alloc_gendisk(BLKIF_MINOR(vdevice), capacity, vdevice, - vdisk_info, sector_size, info); - - bdput(bd); - return err; -} - -void -xlvbd_del(struct blkfront_info *info) -{ - if (info->mi == NULL) - return; - - BUG_ON(info->gd == NULL); - del_gendisk(info->gd); - put_disk(info->gd); - info->gd = NULL; - - xlbd_put_major_info(info->mi); - info->mi = NULL; - - BUG_ON(info->rq == NULL); - blk_cleanup_queue(info->rq); - info->rq = NULL; -} - -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) -int -xlvbd_barrier(struct blkfront_info *info) -{ - int err; - - err = blk_queue_ordered(info->rq, - info->feature_barrier ? QUEUE_ORDERED_DRAIN : QUEUE_ORDERED_NONE, NULL); - if (err) - return err; - printk("blkfront: %s: barriers %s\n", - info->gd->disk_name, info->feature_barrier ? "enabled" : "disabled"); - return 0; -} -#else -int -xlvbd_barrier(struct blkfront_info *info) -{ - printk("blkfront: %s: barriers disabled\n", info->gd->disk_name); - return -ENOSYS; -} -#endif |